206020681 has 2 divisors, whose sum is σ = 206020682. Its totient is φ = 206020680.

The previous prime is 206020651. The next prime is 206020721. The reversal of 206020681 is 186020602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138862656 + 67158025 = 11784^2 + 8195^2 .

It is a cyclic number.

It is not a de Polignac number, because 206020681 - 2¹³ = 206012489 is a prime.

It is a super-3 number, since 3×206020681³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (206020601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103010340 + 103010341.

It is an arithmetic number, because the mean of its divisors is an integer number (103010341).

Almost surely, 2^206020681 is an apocalyptic number.

It is an amenable number.

206020681 is a deficient number, since it is larger than the sum of its proper divisors (1).

206020681 is an equidigital number, since it uses as much as digits as its factorization.

206020681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 206020681 is about 14353.4205330994. The cubic root of 206020681 is about 590.6138215777.

The spelling of 206020681 in words is "two hundred six million, twenty thousand, six hundred eighty-one".